Two goals in the first 12 minutes from the Italy rising star were enough for Paulo Sousa's men to taste victory, despite Luis Suarez hitting back for the visitors
Barcelona's disappointing pre-season continued as they were beaten 2-1 by Fiorentina at the Artemio Franchi on Sunday.
Barca fell to their third loss in the International Champions Cup, nine days ahead of their Uefa Super Cup meeting against Sevilla, as youngster Federico Bernardeschi netted twice in the opening 12 minutes.